Update Python to 3.14

[vidplace7]

DO NOT MERGE until pioarduino >3.3.6 (based on platformio 6.1.19) is released.

Summary by CodeRabbit

• Chores
  • Updated the application’s underlying runtime environment to the latest supported Python release.
  • Refined automated maintenance settings to improve update stability while preparing for a future major release.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 91b10da4-7e53-4e0d-a27b-74da8772195a

📥 Commits

Reviewing files that changed from the base of the PR and between d3f0d83 and 502e72d.

📒 Files selected for processing (2)

• .github/dependabot.yml
• Containerfile

📝 Walkthrough

Walkthrough

Dependabot now ignores selected grpcio-tools updates, and the container base image has been upgraded from Python 3.13 to 3.14 on Trixie.

Changes

Dependency and base image maintenance

Layer / File(s)	Summary
Dependabot grpcio-tools rule .github/dependabot.yml	Ignores semver patch and minor grpcio-tools updates until version 2.x.
Python base image update Containerfile	Changes the base stage image from python:3.13-trixie to python:3.14-trixie.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Poem

A rabbit hops through YAML bright,
While Python climbs to fourteen’s height.
grpcio waits for version two,
The container’s coat is fresh and new.
Hop, hop—maintenance done!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: upgrading the Containerfile base image to Python 3.14.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.github/dependabot.yml:
- Around line 15-20: Update the grpcio-tools entry in the Dependabot ignore
configuration to add a version range limited to versions below 2.0, while
preserving the existing patch and minor update types.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d50afcf2-57b1-4833-892d-0ba2a5433b81

📥 Commits

Reviewing files that changed from the base of the PR and between 464e6d1 and d3f0d83.

📒 Files selected for processing (2)

• .github/dependabot.yml
• Containerfile